Hole locating and drilling device



Feb. 3, .1948. H. e. WHITMORE 2,435,256

HOLE LOCATING AND DRILLING DEVICE Filed May 10; 1944' 2 Sheets-Sheet 1 I INVENTOR. Hem. ryl 'iW/uiihmore ATTORNEYS 1948. H. e. WHITMORE 2,435,25fi

HOLE LOCATING AND DRILLING DEVICE Filed May 10, 1944 2 Sheets-Sheet" 2 IN V EN TOR.

Arm/y flV/u'mare BY ATTORNYS I Patented Feb. 3, 1948 UNITED STATES PATENT OFFICE HOLE LOCATING AND DRILLING DEVICE Henry G. Whitmore, Newburyport, Mass., assignor to Samuel C. Brody, Newton Centre, Mass.

Application May 10, 1944, Serial No. 535,002

3 Claims. I

This invention relates to devices for locating and drilling holes to exact dimensions in a piece of work, and is designed to be used with any machine capable of drilling holes, such as a jigborer, lathe, boring mill, or milling machines.

H-eretofore when using such machines it has always been necessary to fasten the work to the machine and rough-drill the first hole in the work and (except for the lathe) afterwards to move the machine relative to the work in order to locate succeeding holes.

Instead of having the drill strike the work at some point located by the machine itself, my device makes it possible to so locate the point on the work where a hole is to be drilled that the drill will be positively guided to such point.

A characteristic embodiment of my device comprises a lower member to be clamped to or near the work and having a pair of right-angled arms, and an upper member having a pair of angularly disposed arms assembled to the arms of the lower member for adjustment relative thereto longitudinally and transversely over the work, the junction of the arms of the upper member being positioned above the space defined by the arms of the lower member. I provide the members with interengaging means for permitting longitudinal adjustments of the upper member with respect to the lower member and for holding the upper member in its adjusted position with resheet to the lower member.

vice applicable for use with drills or the like ofdiiierent diameters, I provide bushings of the same outside diameter but of difierent inside diameters so that any selected bushing may be positioned within and locked to the guide.

One of the outstanding advantages of my device is that it may be used with any machine capable of drilling holes, even though such machine be badly worn, and hence it is unnecessary 2 to buy an expensive machine, such as a jig borer, for the drilling job. This is due to the fact that with my device the drill is always positively located in exact axial alinement with the hole to be drilled in the work.

Other advantages will appear as the description proceeds of the illustrative embodiment of my invention shown in the accompanying drawing. In the drawings:

Fig. 1 is a perspective view of my device set up for drilling holes of exact dimension in a piece of work.

Fig. 2 is a top plan view thereof, and

Fig. 3 is a perspective view of one of the sliding clamp blocks.

A device in accordance with my invention comprises a lower member generally indicated at Ill adapted to be clamped to or near the work '26 on the table II. The member I!) has two side arms l2 and I3 disposed at right angles to each other and each having parallel inner and outer side walls. I form the top faces of the arms 12 and It for substantially their entire length with slots l4 and I5, preferably of inverted T-shaped cross section. Within the slots I l, l5 are slidably mounted similarly shaped blocks l6 each tapped and threaded at its upper end as at I! to receive clamping bolts I8.

I provide an upper member generally indi-- cated at l9 and comprising a pair of arms and 2| which are preferably, but not necessarily,

, disposed at right angles to each other. The arms 20 and 2| are longitudinally slotted as at 22 and 23 to slidably receive the clamping bolts I8 so that the upper member can be adjusted transversely and longitudinally relative to the lower member ID and the work 26. The member l9 has a guide member generally indicated at 24 which may most conveniently be located exteriorly of the figure defined by the arms l2, l3 and 20, 2i, and which extends downwardly below the plane defined by the upper surface of the lower member ID to facilitate the measurements, as later described.

A guide liner or bushing 30 is adapted to be centered over the hole or spot to be drilled (indicated at 25 on the work 26) and it serves both as a measuring point in measuring its relation to the sides of arms l2 and I3 of the lower member l0 and as a guide for a tool such as a drill, boring tool or the like 21 during operation of said tool. The guide member 24 comprises a hollow cylindrical portion 28, and a selected guide liner or bushing 30 is removably fastened in said portion by a lock screw 29 or the like. In accordance with my invention, I provide a plurality of different guide liners or bushings 3i] of the same outside diameter but of difierent inside diameters so that difierent sized drills may be accurately guided when moved axially through the bore formed by the inside diameter of the selected liner or bushing.

In operating, in accordance with my invention, on a piece of: work,v I either mount mydcvice on the work or close to it, both work andd'evice being rigidly fastened to a fiat plate not shown," which allows work, device and plate to be moved together as a unit and positionediso: that, the; located bushing hole is exactly in line. axially with the spindle of the machine'iwhi'ch is; tobe' used in operation upon the work 26; The work is generally set up parallel with: the innerqsides; of the lower member iii so that the guidev liner or bushing 34 is centered over the hole to be drilled and the upper member [9 is then looked in: that position. In practice, a hole may be located as accurately as is necessary, but in accordance with my invention; my device is used and beforeany change is made in its setting, a reading is taken to measurethedistance of said hole to the outer-or inner sides of arms 12 and I 3 of the-lower member I ll.

Such .measurements maybe taken by using micrometers or size blocks-and measuring from the outer surface of the liner or bushing 30 to the outersides- IZ'and i3-of the lower member l or to the inner sides of said member. If'an outside miorometer'is used; such as is indicated in dotted lines at 3i; then-fromthe measurement should be subtracted the radius of the-liner or bushing 30'.-' Such a distanceobviously should be addedto'a' measurement securediby an inside micrometer or size blocks.

An additional hole or holes may thereafter be accurately located and drilled by loosening the clamping bolts 18 and moving the member [9 asrequired' by additional measurements relative to-the-sides i2 and l3 of the bottom member-l0 tocenter-the liner or bushing '3ilabove the desired-spot to be drilled.

T0 state the operation of the improved hole locating and'drilling device of'the-present application, in other terms; it may-be=said that'thepie'eeofwork 26 and the device-of thisapplicatio'n arebothclamped toa' suitable bottom plate of any preferred or well known' construction; which plate is not shown in the accompany:- ingdrawings as it forms nopart ofthe present invention; The operator next sets the guide bushingofthe device in the position for the drilling of the first hole in the-work piece, by'using a standard pin through the hole of the, bushing and positioning same from two sides of the work piece, using depth gauges or other suitablemeasuring means' for this purpose. After the compietion of the drilling of the first hole, and'before the device is moved to the-location for the drilling of the next hole, the-operator' measures the position of the guide bushing" from either the inside or outside edge of the members and IT by means of a micrometer or similar measuring instrument. Having done this; it is aneasy matter by simple addition'or subtraction to positionthe guide bushing in proper locataking these measurements, it is more convenient for the operator, but not necessary, to consistently use either the inside of members "I and 12, or the outside of said members, throughout the several positioning operations.

If any hole so drilled is required to be subsequently bored, the spindle chuck is elevated to raise the drill 21 above the guide liner or bushing 30, and the entire upper member I9 is removed without changing the position of the work or the lateral position of the spindle chuck in which the drill 21 is mounted. Then the drill 21 is removed from the spindle chuck and a boring head is placed therein andlth'e boring operation is carried out to completion. The foregoing is also true of a reaming, tapping or any other operation of a nature which can be producediby attoormoving by rotation, such as counterboring, countersinking, outside turning, etc.

Obviously, the mechanical means shown and describedmay be oivarious design a long as they provide. meansior; accurately guiding drills or the like to an accurately located spot to be drilled.

What I therefore claim and desire to secure by liettersPatent is:

I. Ina device of the class described afi'at' top right-angled lower block comprising a pairor arms disposed at right angles to' eaclrother, said block having slots extending longitudinally: of the" upper" faceof'each of its arms, a clamp piece within each of said" slots and readily slid'able along the'l'ength of'said slots, an upperblock hav ing longitudinall'y slottedflat arms disposed across the slotted-upper faces of the lowerblock' arms, adjustable bolts passing through the slots-in the arms of the upper blockand' anchoredwithin said clamp-pieces'topermit adjustment of saidupper block with respect to said lowerblockandto retain said blocksin adjustedposition, and a drill.

guide carried at the exterior angle of juncture of the arms ofthe upper block and adjustably positionable over apiece of work located within" the interiorangle of the lowerblock and below the plane of the bottom surfaceof the upper block;

2. In a deviceof the class described, a flat top" right-angledi lower' block" comprising a pair of arm -disposed atright angles to each other; said"' blockhaving T-sl'ots: extending longitudinally of the; upper face of each of its arms, a clamp. piece slidable in each oisaid slots; an angled upper block comprisinga pairof connected; angularly disposed" and" longitudinally *slott'ed flatarms disposableacross the slotted upper faces of the lower block" arms, bolts passing through'the slots in the arms of the'upperblock and'thread a guide-member positioned at the exterior angle ofjuncture of the arms; of; the upper. block; and" a removable replaceable guide liner or bushing, mounted insaid guide member: and' 'a'dapteddo' guide a drill passed therethrough; said guide" member and its associated; guide lineroribuslr;

ing being adjustably'positionable. over a. piece of work-locatedwithin the interior angle of the. lower blockand' below the planeiof the bottom surface of the; upper block.

3. A device-cf: the class describedlinclaim. 11;

in which the drill guide comprises an openingthrough-- the upper block adjacent: the exterior,

angle of'juncture .of the armsof saidlupper. block. and'a bushingremovably secured"ingsaidmpening,

tiOHfOF-the drilling" of thesecond hole: Wherrlt and having an inside diameter slightly greater 5 than the outside diameter of a drill passed therethrough and guided thereby.

HENRY G. WHITMORE'.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,124,118 Okerfelt July 19, 1938 2,342,033 Barabas Feb. 15, 1944 1,408,098 Knapp et a1. Feb. 28, 1922 Number MacDonald Feb. 8, 1944 

